I've tried two and they are both too small. My 2 yr old boy is over 37in tall and is 30 pounds. He's slim but the potties are just way too narrow, and short. He' make a mess if he'd go in those. I have a seat to go on the toilet but it's really too high for him to feel comfortable so I wanted a potty for him to sit on.

We used the Baby Bjorn little potty and the Baby Bjorn larger molded plastic potty, both of which worked well. I imagine the Little Potty is probably too small for your child (though my ds used it until he was about 3.5, it was just what he was used to). The larger version didn't seem nearly as comfortable, but it was definitely better suited for a taller kid.